$def with (form )


<head>
    <style>
        tr {}
        
        button {
            width: 100%;
            background-color: #4CAF50;
            /* Green */
            border: none;
            color: white;
            padding: 15px 32px;
            text-align: center;
            text-decoration: none;
            border-radius: 8px;
            display: inline-block;
            font-size: 16px;
            -webkit-transition-duration: 0.4s;
            /* Safari */
            transition-duration: 0.4s;
        }
        
        button:hover {
            background-color: #4CAF50;
            /* Green */
            color: white;
        }
        
        textarea {
            border: 0;
            border-radius: 5px;
            background-color: rgba(241, 241, 241, .98);
            padding: 10px;
            resize: none;
            margin-bottom: 5px;
        }
    </style>
</head>
<form action="" method="post">

    <div class="row">
        <div class="  col-sm-offset-3 col-xs-12 col-sm-4  "> $:form.render()</div>
    </div>


</form>